Reed Lunars Method Test Cases Last updated: November 28, 2017 Ho for moon and body are input but Nautical Almanac correction for the Ha->Ho is required and input with opposite sign. Worth comparing technique with Letcher which requies the fewest inputs. Comments on NA Altitude Corrections: The Sun correction table includes refraction, parallax, and semi- diameter. The Stars and Planets table is refraction only, but the Additional Correction for Venus and Mars takes care of parallax. This applies to the A2 and A3 tables. The Moon tables in the back of the Almanac include refraction, parallax, semi-diameter, and augmentation. Stan Klein comments 10/8/2017 Reed Test Cases ------------------------------------------------------------ Case 1 Case 2 Case 3 Case 4 ------------------------------------------------------------ Moon Moon HoMoon 46°39.5' 28°20.8' 52°54.0' 13°38.3' HoMoon corrected for UL/LL, semi-diameter Alt Cor -0°36.5' -00°46.72' -34.9' -48.8' Alt Cor Fron NA, correction for SD and refraction, use opposite sign Body Sun star Sun Sun Body HoBody 47°12.0' 48°26.82' 32°48.4' 30°05.0' HoBody corrected for UL/LL Alt Cor 0°00.8' 0°00.72' 01.4' 01.5' Alt Cor From NA, correction for SD and refraction, use opposite sign LDpc 80°39.3' 83°57.55' 63°14.55' 78°58.38' LDpc Note that effect of Ho and AltCor is how much bodies were displaced by Ha to Ho that changed the LDo to LDpc >A %m 0.909 0.7980 0.3392 0.4782 >A %m >B %b 0.907 0.6004 0.7377 0.1647 >B %b >Q 0.001 0.0031 0.0043 0.0073 >Q >%Change -0.670 -0.728 -0.278 -0.478 >%Change >LDc 80°06.9' 83°20.9' 63°04.0' 78°35.73' >LDc >RBA 142°45.5' 115°21.9' 87°57.4' 85°00.9' >RBA Relative Bearing Angle between moon-body vertical circles Time Time LDo 20:16:37 14:43:55 16:35:20 LDo LDc 20:16:44 14:43:55 16:35:36 LDc Dif 07 0 16 Dif Lon err 02.0' 0 04.0' Lon err ------------------------------------------------------------ Case References: 1) Example taken from "Lunars are Easy" paper by Frank Reed http://reednavigation.com/lunars/easylun.html, Thompson- Bowditch check compares very well. See those test cases. 2) ? 3) Reversed engineered to get pure Reed example LDa=62°42.25' KP=42°00.2'N 074°07.5'W Oct 14, 2017 GMT14:43:55 LDpc=62°42.25'+16.1'+16.0'+00.2'=63°14.55' SDs and augmentation 4) Mystic Seaport Workshop, Lunars exercise, November 15, 2014, Popko's best sight #4